Hello Everyone!
I'm working with a biomass with a high potassium level, it can't be burned in a conventional boiler system because of ash fouling and slagging problems. So, i was researching and i found that melting problems starts with a relationship between potassium and silica, in my case this biomass has low levels of silica. However i have the doubt if it is always true, since the relationship is in a document for combustion by fluidized bed and in my case I would like to know if it applies too in a fixed bed.
So, if anyone has additional information about this topic that can share, I will be eternally grateful.
Dear Juan
Since it would be strongly composition-dependent, I suggest that you study the behaviour of the inorganic components of your biomass material with FactSage. In your case determining phase distribution as a function of temperature would be very insightful. You can also do this in Python with ChemAppPy.
All the best
Johan
Alkali reactions with silica occur in all high-temperature and even moderate-temperature combustion systems, including fixed beds, fluidized beds and entrained flow systems. They can lead to extreme slagging and fouling problems and to corrosion problems.
well the ash formation is a fact you must expect and depend on the ash content of the fuel. The silica is probably responsible for a higher ash melting point but potasiuum probably make that temperature lower. Coorosion by alkali and wearing caused by the silica are aditional problems. the design of the combustion system is crucial and you need to avoid the hot spot created by a bad air distribution and channeling. a hot spot produces high local temperature (not detected by the measuring system) and you will have melting of ashes, which become solids when are in contact with colder areas. shake and revolving system for the bed were created to make easy the fuel circulation and solve the mentioned problems
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